/* Dark is the default theme; :root[data-theme="light"] overrides below. */
:root,
:root[data-theme="dark"] {
  --bg: #000000;
  --surface: #1c1c1e;
  --surface-raised: #2c2c2e;
  --text: #f5f5f7;
  --text-secondary: #98989d;
  --accent: #0a84ff;
  --accent-hover: #3d9bff;
  --border: #38383a;
  --danger: #ff453a;
  --radius: 14px;
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --topbar-bg: rgba(28,28,30,0.85);
  --overlay-bg: rgba(0,0,0,0.6);
  --scrim: rgba(0,0,0,0.85);
}

:root[data-theme="light"] {
  --bg: #f5f5f7;
  --surface: #ffffff;
  --surface-raised: #ffffff;
  --text: #1d1d1f;
  --text-secondary: #6e6e73;
  --accent: #0071e3;
  --accent-hover: #0077ed;
  --border: #d2d2d7;
  --danger: #ff3b30;
  --radius: 14px;
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --topbar-bg: rgba(245,245,247,0.85);
  --overlay-bg: rgba(0,0,0,0.4);
  --scrim: rgba(0,0,0,0.9);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background: var(--topbar-bg);
  backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--border);
}

.topbar .title { font-size: 20px; font-weight: 700; }

.topbar .actions { display: flex; gap: 10px; align-items: center; }

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--surface);
  border: 1px solid var(--border);
  font-size: 18px;
  cursor: pointer;
  color: var(--text);
}
.icon-btn:hover { background: var(--surface-raised); }

.container { max-width: 1100px; margin: 0 auto; padding: 12px 16px 90px; }

.tabs {
  display: flex;
  gap: 8px;
  padding: 8px 16px;
  overflow-x: auto;
}

.tab {
  padding: 8px 16px;
  border-radius: 999px;
  background: var(--surface);
  border: 1px solid var(--border);
  font-size: 14px;
  font-weight: 600;
  white-space: nowrap;
}

.tab.active { background: var(--accent); color: white; border-color: var(--accent); }

.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-wrap: wrap;
  font-size: 14px;
  color: var(--text-secondary);
  padding: 6px 0 12px;
}

.breadcrumbs a { color: var(--accent); font-weight: 600; }

.item-count-row {
  font-size: 13px;
  color: var(--text-secondary);
  padding-bottom: 10px;
}

.view-switch { display: flex; gap: 6px; }

.view-switch button {
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: 8px;
  padding: 6px 10px;
  font-size: 13px;
  cursor: pointer;
}

.view-switch button.active { background: var(--accent); color: #fff; border-color: var(--accent); }

.tag-chip-row { display: flex; gap: 8px; overflow-x: auto; padding: 4px 0 14px; }

.tag-chip {
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 13px;
  background: var(--surface);
  border: 1px solid var(--border);
  white-space: nowrap;
  cursor: pointer;
}

.tag-chip.active { background: var(--surface-raised); border-color: var(--accent); color: var(--accent); }

/* Boxes / grid view */
.grid-boxes {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: 12px;
}

.box-item {
  background: var(--surface);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  position: relative;
  cursor: pointer;
}

.box-thumb {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  background: var(--surface-raised);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 32px;
  position: relative;
}

.box-label {
  padding: 6px 8px;
  font-size: 12px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.folder-box .box-thumb { background: var(--surface-raised); }

.folder-delete-btn {
  position: absolute;
  top: 6px;
  right: 6px;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: none;
  background: rgba(0,0,0,0.45);
  color: #fff;
  font-size: 13px;
  cursor: pointer;
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: center;
}
.folder-delete-btn:hover { background: var(--danger); }

.thumb-spinner {
  width: 20px; height: 20px; border-radius: 50%;
  border: 2px solid var(--border); border-top-color: var(--accent);
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* List view */
.list-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 8px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.list-row:first-child { border-top-left-radius: var(--radius); border-top-right-radius: var(--radius); }
.list-row:last-child { border-bottom: none; border-bottom-left-radius: var(--radius); border-bottom-right-radius: var(--radius); }

.list-thumb {
  width: 44px; height: 44px; border-radius: 8px; object-fit: cover; background: var(--surface-raised);
  display: flex; align-items: center; justify-content: center; font-size: 20px; flex-shrink: 0;
}

.list-row .meta { flex: 1; min-width: 0; }
.list-row .name { font-size: 15px; font-weight: 500; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.list-row .sub { font-size: 12px; color: var(--text-secondary); }

/* Details / table view */
.details-table { width: 100%; border-collapse: collapse; background: var(--surface); border-radius: var(--radius); overflow: hidden; }
.details-table th, .details-table td { text-align: left; padding: 10px 12px; font-size: 13px; border-bottom: 1px solid var(--border); }
.details-table th { color: var(--text-secondary); font-weight: 600; background: var(--surface-raised); }

.section-card { background: var(--surface); border-radius: var(--radius); border: 1px solid var(--border); overflow: hidden; margin-bottom: 16px; }

.fab {
  position: fixed;
  right: 20px;
  bottom: calc(20px + var(--safe-bottom));
  width: 58px;
  height: 58px;
  border-radius: 50%;
  background: var(--accent);
  color: white;
  font-size: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 6px 16px rgba(0,0,0,0.2);
  border: none;
  cursor: pointer;
  z-index: 30;
}

.modal-backdrop {
  position: fixed; inset: 0; background: var(--overlay-bg);
  display: none; align-items: flex-end; justify-content: center; z-index: 50;
}
.modal-backdrop.open { display: flex; }

.modal-sheet {
  background: var(--surface);
  width: 100%;
  max-width: 480px;
  border-radius: 20px 20px 0 0;
  padding: 20px;
  max-height: 85vh;
  overflow-y: auto;
}
@media (min-width: 640px) {
  .modal-backdrop { align-items: center; }
  .modal-sheet { border-radius: 20px; }
}

.modal-sheet h3 { margin-top: 0; }

.btn {
  display: inline-block;
  padding: 10px 18px;
  border-radius: 10px;
  background: var(--accent);
  color: white;
  border: none;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
}
.btn:hover { background: var(--accent-hover); }
.btn.secondary { background: var(--surface); color: var(--text); border: 1px solid var(--border); }
.btn.danger { background: var(--danger); }
.btn.block { display: block; width: 100%; text-align: center; }

input[type=text], input[type=password], input[type=email], input[type=file],
input[type=number], input[type=search], input[type=tel], input[type=url], select, textarea {
  width: 100%;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  font-size: 15px;
  background: var(--surface);
  color: var(--text);
  margin-bottom: 12px;
}

.form-group label { display: block; font-size: 13px; color: var(--text-secondary); margin-bottom: 4px; }

.messages { list-style: none; margin: 0 0 12px; padding: 0; }
.messages li { padding: 10px 14px; border-radius: 10px; margin-bottom: 8px; font-size: 14px; }
.messages li.success { background: rgba(52,199,89,0.15); color: #34c759; }
.messages li.error { background: rgba(255,69,58,0.15); color: #ff453a; }

.login-wrap {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.login-card {
  background: var(--surface);
  border-radius: 20px;
  padding: 32px 28px;
  width: 100%;
  max-width: 380px;
  box-shadow: 0 10px 40px rgba(0,0,0,0.08);
  text-align: center;
}
.login-card h1 { font-size: 26px; margin-bottom: 4px; }
.login-card p.subtitle { color: var(--text-secondary); margin-top: 0; margin-bottom: 24px; }

.empty-state {
  text-align: center;
  color: var(--text-secondary);
  padding: 60px 20px;
}

.overflow-menu-btn { background: none; border: none; font-size: 20px; cursor: pointer; padding: 4px 8px; }

.checkbox-row { display: flex; align-items: center; gap: 8px; padding: 8px 0; font-size: 14px; }

.progress-bar { height: 4px; background: var(--border); border-radius: 2px; overflow: hidden; margin-top: 8px; }
.progress-bar .fill { height: 100%; width: 0%; background: var(--accent); transition: width 0.2s; }

/* ---------------------------------------------------------------- */
/* Full-screen media viewer (lightbox)                               */
/* ---------------------------------------------------------------- */

.lightbox {
  position: fixed;
  inset: 0;
  background: var(--scrim);
  z-index: 100;
  display: none;
  flex-direction: column;
}
.lightbox.open { display: flex; }

.lightbox-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: calc(10px + env(safe-area-inset-top, 0px)) 12px 10px;
  flex-shrink: 0;
  z-index: 2;
}

.lightbox-topbar .lightbox-title {
  flex: 1;
  min-width: 0;
  text-align: center;
  color: #fff;
  font-size: 14px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  padding: 0 8px;
}

.lightbox-icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(255,255,255,0.12);
  color: #fff;
  border: none;
  font-size: 18px;
  cursor: pointer;
  flex-shrink: 0;
}
.lightbox-icon-btn:hover { background: rgba(255,255,255,0.22); }

.lightbox-stage {
  flex: 1;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 0;
  overflow: hidden;
}

.lightbox-media {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.lightbox-media img, .lightbox-media video {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

.lightbox-media .generic-file {
  color: #fff;
  text-align: center;
}
.lightbox-media .generic-file .icon { font-size: 72px; }

.lightbox-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(0,0,0,0.35);
  color: #fff;
  border: none;
  font-size: 22px;
  cursor: pointer;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: center;
}
.lightbox-nav.prev { left: 10px; }
.lightbox-nav.next { right: 10px; }
.lightbox-nav:disabled { opacity: 0.25; cursor: default; }

@media (max-width: 640px) {
  .lightbox-nav { width: 38px; height: 38px; }
}

.lightbox-menu {
  position: absolute;
  inset: 0;
  background: var(--overlay-bg);
  display: none;
  align-items: flex-end;
  justify-content: center;
  z-index: 10;
}
.lightbox-menu.open { display: flex; }

.lightbox-menu-sheet {
  background: var(--surface);
  color: var(--text);
  width: 100%;
  max-width: 480px;
  border-radius: 20px 20px 0 0;
  padding: 20px;
  max-height: 80vh;
  overflow-y: auto;
}
@media (min-width: 640px) {
  .lightbox-menu { align-items: center; }
  .lightbox-menu-sheet { border-radius: 20px; }
}

.lightbox-menu-sheet h3 { margin-top: 0; word-break: break-word; }

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--surface);
  border: 1px solid var(--border);
  font-size: 16px;
  cursor: pointer;
  color: var(--text);
}
.theme-toggle:hover { background: var(--surface-raised); }

/* ---------------------------------------------------------------- */
/* Sort dropdown                                                     */
/* ---------------------------------------------------------------- */

select {
  width: auto;
  margin-bottom: 0;
  padding: 8px 10px;
}

/* ---------------------------------------------------------------- */
/* Multi-select mode                                                 */
/* ---------------------------------------------------------------- */

.select-check {
  position: absolute;
  top: 6px;
  left: 6px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 2px solid rgba(255,255,255,0.8);
  background: rgba(0,0,0,0.25);
  z-index: 5;
  display: none;
}
.select-check::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 50%;
}
.select-check.checked {
  background: var(--accent);
  border-color: var(--accent);
}
.select-check.checked::after {
  content: '✓';
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 13px;
  font-weight: 700;
}

body.select-mode .select-check { display: block; }
body.select-mode .box-item.selectable-item,
body.select-mode .list-row.selectable-item { cursor: pointer; }

.list-row .select-check,
tr .select-check { position: relative; top: 0; left: 0; }

.select-bar {
  position: fixed;
  left: 0; right: 0; bottom: 0;
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 12px 16px calc(12px + var(--safe-bottom));
  display: none;
  align-items: center;
  justify-content: space-between;
  z-index: 40;
}
.select-bar.open { display: flex; }

/* ---------------------------------------------------------------- */
/* Share link display                                                */
/* ---------------------------------------------------------------- */

.share-link-row {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px;
  margin-top: 12px;
}
.share-link-url {
  word-break: break-all;
  font-size: 13px;
  color: var(--text-secondary);
}

/* ---------------------------------------------------------------- */
/* Toast notifications                                                */
/* ---------------------------------------------------------------- */

.toast {
  position: fixed;
  left: 50%;
  bottom: calc(24px + var(--safe-bottom));
  transform: translate(-50%, 20px);
  background: var(--surface-raised);
  color: var(--text);
  border: 1px solid var(--border);
  padding: 12px 20px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
  box-shadow: 0 8px 24px rgba(0,0,0,0.25);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s, transform 0.2s;
  z-index: 200;
  white-space: nowrap;
}
.toast.open {
  opacity: 1;
  transform: translate(-50%, 0);
}

/* ---------------------------------------------------------------- */
/* Drag-and-drop upload overlay                                      */
/* ---------------------------------------------------------------- */

.drop-overlay {
  position: fixed;
  inset: 0;
  z-index: 150;
  background: rgba(10, 132, 255, 0.15);
  display: none;
  align-items: center;
  justify-content: center;
  pointer-events: none;
}
.drop-overlay.open { display: flex; }

.drop-overlay-inner {
  border: 3px dashed var(--accent);
  border-radius: 24px;
  padding: 48px 64px;
  background: var(--surface);
  color: var(--text);
  font-size: 20px;
  font-weight: 600;
  text-align: center;
}

/* ---------------------------------------------------------------- */
/* Upload progress                                                   */
/* ---------------------------------------------------------------- */

.upload-progress-wrap {
  position: fixed;
  left: 16px;
  right: 16px;
  bottom: 90px;
  z-index: 40;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px 14px;
  display: none;
}
.upload-progress-wrap.open { display: block; }

.upload-progress-label {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

/* ---------------------------------------------------------------- */
/* Generic loading spinner overlay (e.g. while a zip is built)       */
/* ---------------------------------------------------------------- */

.spinner-overlay {
  position: fixed;
  inset: 0;
  z-index: 210;
  background: var(--scrim);
  display: none;
  align-items: center;
  justify-content: center;
}
.spinner-overlay.open { display: flex; }

.spinner-overlay-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  color: #fff;
  font-size: 15px;
  font-weight: 600;
}

.spinner {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 4px solid rgba(255,255,255,0.25);
  border-top-color: #fff;
  animation: spin 0.8s linear infinite;
}